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Superior Mechanical Properties of Graphene Composites

机译：石墨烯复合材料的优异机械性能

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Graphene is a 2D material with atomic thickness and possesses unusual thermal, electrical, and mechanical properties [1,2]. Especially, intrinsic strength of 130 GPa and Young's modulus of 1 TPa make graphene very attractive for ideal 2D reinforcement fillers both for metal and polymer composites. Recently, our group proved the effectiveness of graphene as a barrier to constrain dislocation motions in layered metal/graphene composites and explained the underlying mechanism with in situ and ex situ TEM analysis and molecular dynamic simulations [3]. The effective pinning of dislocation at the boundary of graphene and metal can be maximized if the flake type of graphene could be dispersed well in the matrix of metal. However, poor dispersion and relatively low decomposition temperature of graphene makes it difficult to turn up the effect. Here we present our efforts of molecular level mixing and spark plasma sintering that finally overcome those problems. 2.5 vol.% of reduced graphene oxide (RGO) flake in Cu matrix could have 131 GPa and 284 MPa of elastic modulus and yield strength, respectively. The enhanced adhesion between RGO and Cu measured from double cantilever beam test and good dispersion of graphene flakes are the key to explain the superior behaviour. Furthermore, enhanced mechanical and thermal properties of polymer/graphene composites by using non-oxidized graphene flakes with non-covalent functionalization will strongly support the importance of graphene for next generation, high strength-low weight polymer composites.
机译：石墨烯是一种具有原子厚度的2D材料，具有异常的热，电和机械性能[1,2]。尤其是，130 GPa的固有强度和1 TPa的杨氏模量使石墨烯对于金属和聚合物复合材料的理想2D增强填料非常有吸引力。最近，我们的小组证明了石墨烯作为约束层状金属/石墨烯复合材料中位错运动的障碍的有效性，并通过原位和异位TEM分析和分子动力学模拟解释了其潜在机理[3]。如果片状石墨烯可以很好地分散在金属基体中，则可以最大化在石墨烯和金属之间的位错有效钉扎。然而，差的分散性和相对较低的石墨烯分解温度使得难以提高效果。在这里，我们介绍了分子水平混合和火花等离子体烧结的技术，这些技术最终克服了这些问题。 Cu基体中2.5％（体积）的还原氧化石墨烯（RGO）薄片的弹性模量和屈服强度分别为131 GPa和284 MPa。通过双悬臂梁测试测得的RGO与Cu之间的附着力增强以及石墨烯薄片的良好分散性是解释其优异性能的关键。此外，通过使用具有非共价官能化功能的非氧化石墨烯薄片提高聚合物/石墨烯复合材料的机械和热性能，将极大地支持石墨烯对于下一代高强度，低重量的聚合物复合材料的重要性。

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